OpenVSwitch Installation problem

When I try to install and configure openvswitch on 8.3 getting the following error

ovs$ rpmbuild -bb --nocheck ~/rpmbuild/SOURCES/openvswitch-2.9.2/rhel/openvswitch_no_kmod.spec
error: Failed build dependencies:
python-six is needed by openvswitch-2.9.2-1.x86_64
python-sphinx is needed by openvswitch-2.9.2-1.x86_64

rpm -q epel-release
epel-release-8-10.el8.noarch

dnf install centos-release-openstack-train

Last metadata expiration check: 0:21:40 ago on Fri 14 May 2021 01:54:52 AM EDT.
No match for argument: centos-release-openstack-train
Error: Unable to find a match: centos-release-openstack-train

Anyone has idea on this please update me here.
Ref:- How To Install Open vSwitch on CentOS 8 | RHEL 8 - Linux Windows and android Tutorials

Anyone aware about this

ModuleNotFoundError: No module named ‘six’
Could not import extension sphinx.builders.applehelp (exception: No module named ‘pygments’)

AlmaLinux can’t support OpenVSwitch now. lack of related cloud yum repo.
please wating.

I have compiled it with source and working fine now thank you.